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Note 14 - Financial Instruments and Fair Value Measurements (Details) - Estimated Fair Value of Financial Instruments, Current Year - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 28, 2014
Short-Term Investments
Available for sale securities	$ 40,593	$ 46,638
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Short-Term Investments
Available for sale securities	6,988	23,984
Corporate Bond Securities [Member]
Short-Term Investments
Available for sale securities	33,605	21,693
Certificates of Deposit [Member]
Short-Term Investments
Available for sale securities		961
Fair Value, Inputs, Level 2 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Short-Term Investments
Available for sale securities	6,988	23,984
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]
Short-Term Investments
Available for sale securities	$ 33,605	21,693
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Short-Term Investments
Available for sale securities		$ 961

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 25



-Paragraph 1



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 5



-Subparagraph (aa)



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



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-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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